Which of the following halides of group 13 el | vedclass

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(D) The acidity of group $13$ trihalides $(BX_3)$ depends on the extent of back-bonding between the halogen and the boron atom. In $BF_3$,the small si

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$BBr_3$

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(D) The acidity of group $13$ trihalides $(BX_3)$ depends on the extent of back-bonding between the halogen and the boron atom. In $BF_3$,the small size of the fluorine atom allows for effective $p\pi-p\pi$ back-bonding from the filled $2p$ orbital of $F$ to the empty $2p$ orbital of $B$. As the size of the halogen increases from $F$ to $I$,the effectiveness of back-bonding decreases,making the boron atom more electron-deficient and thus more acidic. Therefore,the order of Lewis acidity is $BF_3 Among the given options,$BBr_3$ is the most acidic.

Which of the following halides of group $13$ elements is the most acidic?

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